compressor troubleshooting

IE101H

Installation, Operation & Maintenance ManualLiquid Transfer-Vapor Recovery Compressors

Warning: (1) Periodic inspection and maintenance of Corken products is essential. (2) Inspection, maintenance and installation of Corken products must be made only by experienced, trained and qualified personnel. (3) Maintenance, use and installation of Corken products must comply with Corken instructions, applicable laws and safety standards (such as NFPA Pamphlet 58 for LP-Gas and ANSI K61.1-1972 for Anhydrous Ammonia). (4) Transfer of toxic, dangerous, flammable or explosive substances using Corken products is at users risk and equipment should be operated only by qualified personnel according to applicable laws and safety standards.

WarningInstall, use and maintain this equipment according to Corken, Inc. instructions and all applicable federal, state, local laws and codes, and NFPA Pamphlet 58 for LP-Gas or ANSI K61.1-1989 for Anhydrous Ammonia. Periodic inspection and maintenance is essential.

Corken One Year Limited WarrantyCorken, Inc. warrants that its products will be free from defects in material and workmanship for a period of 12 months following date of purchase from Corken. Corken products which fail within the warranty period due to defects in material or workmanship will be repaired or replaced at Corkens option, when returned freight prepaid to Corken, Inc., 3805 N.W. 36th Street, Oklahoma City, Oklahoma 73112.

Parts subject to wear or abuse, such as mechanical seals, blades, piston rings, valves, and packing, and other parts showing signs of abuse are not covered by this limited warranty. Also, equipment, parts and accessories not manufactured by Corken but furnished with Corken products are not covered by this limited warranty and purchaser must look to the original manufacturers warranty, if any. This limited warranty is void if the Corken product has been altered or repaired without the consent of Corken.

ALL impLied WArrAnties, inCLuding AnY impLied WA rrAntY Of merChAntAbiLitY Or fitness fOr A pArtiCuLAr purpOse, Are expressLY negAted tO the extent permitted bY LAW And shALL in nO event extend beYOnd the expressed WArrAntY periOd.

Corken disclaims any liability for consequential damages due to breach of any written or implied warranty on Corken products. Transfer of toxic, dangerous, flammable or explosive substances using Corken products is at the users risk. Such substances should be handled by experienced, trained personnel in compliance with governmental and industrial safety standards.

Contacting the factoryFor your convenience, the model number and serial number are given on the compressor nameplate. Space is provided below for you to keep a written record of this information.

ALWAyS INCLudE THE MOdEL NuMbEr ANd SErIAL NuMbEr WHEN OrdErING PArTS.

Model No.

Serial No.

date Purchased

date Installed

Purchased From

Installed by

impOrtAnt nOte tO CustOmers!

COrKen, inC. does not recommend ordering parts from general descriptions in this manual. to minimize the possibility of receiving incorrect parts for your machine, Corken strongly recommends you order parts according to part numbers in the Corken service manual and/or installation, Operation, & maintenance (iOm) manual. if you do not have the appropriate service manual pages, call or write Corken with model number and serial number from the nameplate on your compressor.

2

table of ContentsChApter 1intrOduCtiOn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pAge 4

1.1 Liquid Transfer by Vapor differential Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.2 residual Vapor recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.3 Compressor Construction Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ChApter 2instALLing YOur COrKen COmpressOr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pAge 82.1 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.2 Foundation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.3 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.4 Liquid Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.5 driver Installation / Flywheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.6 Crankcase Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.7 relief Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.8 Truck Mounted Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.9 Shutdown/Alarm devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

ChApter 3stArting up YOur COrKen COmpressOr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pAge 143.1 Inspection After Extended Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.2 Flywheel and V-belt Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.3 Crankcase Oil Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.4 Startup Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

ChApter 4rOutine mAintenAnCe ChArt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pAge 16

ChApter 5rOutine serviCe And repAir prOCedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pAge 175.1 Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175.2 Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.3 Piston rings and Piston ring Expanders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.4 Pistons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.5 Piston rod Packing Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.6 Cylinder and Packing replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.7 bearing replacement for Crankcase and Connecting rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.7.1 Wrist Pin bushing replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.7.2 replacing Connecting rod bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.7.3 replacing roller bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.8 Oil Pump Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235.9 Servicing the Four-Way Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

ChApter 6extended stOrAge prOCedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pAge 25

AppendiCesA. repair Kits and Gasket Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2627b. Model Number and Mounting Identification Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2829C. Operating and Material Specifications, bolt Torque Values, Clearance and dimensions . . . . . . . . . . . . . . 3035d. Compressor Selection

Mounting Selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 butane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Propane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Ammonia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

E. Outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4050F. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51G. Model 91 and F91 Parts details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5259H. Model 291 and F291 Parts details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6067I. Model 490, 491, and F491 Parts details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6875J. Model 691 and F691 Parts details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7683K. Model d891 Parts details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8493

3

Chapter 1introduction

threaded and Ansi flanges:Compressors are available in either threaded NPT, ANSI, or dIN flanged connections.

high-efficiency valves:Corken valves offer quiet operation and high durability in oil-free gas applications. Specially designed suction valves which tolerate small amounts of condensate are used in liquid transfer-vapor recovery compressors.

O-ring head gaskets:Easy to install O-ring head gaskets providing highly reliable seals.

ductile iron construction:All cylinders and heads are ductile iron for maximum thermal shock endurance.

self-lubricating ptfe piston rings:Corken provides a variety of state-of-the-art piston ring designs to provide the most cost-effective operation of compressors for non-lube service. The step-cut design provides higher efficiencies during the entire life of the piston ring.

positively locked pistons:Simple piston design allows end clearance to be precisely set to provide maximum efficiency and long life.

self-lubricating piston rod seals:Seals constructed of PTFE incorporating special fillers to ensure no oil carry over and maximize leakage control. Spring loaded seal design self adjusts to compensate for normal wear.

nitride-coated piston rods:Impregnated nitride coating provides superior corrosion and wear resistance.

nameplate:Serves as packing adjusting screw cover (see figure 1.1A).

Cast iron crossheads:durable cast iron crossheads provide superior resistance to corrosion and galling.

pressure-lubricated crankcase with filter:Self-reversing oil pump ensures proper lubrication regardless of directional rotation to main and connecting rod bearings. Standard 10-micron filter ensures long-lasting bearing life (not available on Model 91).

Construction DetailsModel F291 Compressor

4

Compressor reduces pressure in storage tank by removing vapor

Compressor increases pressure in tank car by adding vapor

Pressure difference between tanks causes liquid to flow out of the tank car into the storage tank

Four Way Valve Position 1

Vapor Line

Vapo

r Li

ne

Liquid Line

Figure 1.1A: Typical Nameplate(Also Serves as the Packing Adjusting Screw Cover)

1.1 Liquid transfer by vapor differential pressureCorken LPG/NH3 compressors are designed to transfer liquefied gases such as butane/propane mixtures (liquefied petroleum gas or LPG) and Anhydrous Ammonia (NH3) from one tank to another. Liquefied gases such as LPG & NH3 are stored in closed containers where both the liquid and vapor phases are present.

There is a piping connection between the vapor sections of the storage tank and the tank being unloaded, and there is a similar connection between the liquid sections of the two tanks. If the connections are opened, the liquid will seek its own level and then flow will stop; however, by creating a pressure in the tank being unloaded which is high enough to overcome pipe friction and any static elevation difference between the tanks, all the liquid will be forced into the storage tank (see figure 1.1b). The gas compressor accomplishes

this by withdrawing vapors from the storage tank, compressing them and then discharging into the tank to be unloaded. This procedure slightly decreases the storage tank pressure and increases the pressure in the other tank, thereby causing the liquid to flow.

The process of compressing the gas also increases the temperature, which aids in increasing the pressure in the tank being unloaded.

1.2 residual vapor recoveryThe principle of residual vapor recovery is just the opposite of liquid transfer. After the liquid has been transferred, the four-way control valve (or alternate valve manifolding) is reversed so that the vapors are drawn from the tank just unloaded and discharged into the receiving tank. Always discharge the recovered vapors into the liquid section of the receiving tank. This will allow the hot, compressed vapors to condense, preventing an undesirable increase in tank pressure (see figure 1.2A).

residual vapor recovery is an essential part of the value of a compressor. There is an economical limit to the amount of vapors that should be recovered, however.

When the cost of operation equals the price of the product being recovered, the operation should be stopped. For most cases in LP Gas and Anhydrous Ammonia services, this point is reached in the summer when the compressor inlet pressure is 40 to 50 psig (3.8 to 4.5 bars). A good rule of thumb is not to operate beyond

Figure 1.1B: Liquid transfer by vapor differential pressure

5

Vapor is bubbled through liquid to help cool and recondense it

Removing vapor from tank causes liquid heel to boil into vapor

Liquid line is valved closed during vapor recovery.

Four Way Valve Position 2

Liquid Heel

Vapor Line

Vapor Line

the point at which the inlet pressure is one-fourth the discharge pressure. Some liquids are so expensive that further recovery may be profitable, but care should be taken that the ratio of absolute discharge pressure to absolute inlet pressure never exceeds 7 to 1. Further excavation of very high value products would require a Corken two-stage gas compressor.

Invariably, there is some liquid remaining in the tank after the liquid transfer operation. This liquid heel must be vaporized before it can be recovered, so do not expect the pressure to drop immediately. Actually, more vapor will be recovered during the first few minutes while this liquid is being vaporized than that during the same period of time later in the operation. remember that more than half of the economically recoverable product is usually recovered during the first hour of operation on properly sized equipment.

1.3 Compressor Construction featuresThe Corken liquid transfer-vapor recovery compressor is a vertical single-stage, single-acting reciprocating compressor designed to handle flammable gases like LPG and toxic gases such as ammonia. Corken compressors can handle these potentially dangerous gases because the LPG/NH3 is confined in the compression chamber and isolated from the crankcase and the atmosphere. A typical liquid transfer-vapor recovery compressor package is shown in figure 1.3A.

Corken gas compressors are mounted on oil lubricated crankcases that remain at atmospheric pressure. Crankshafts are supported by heavy-duty roller bearings and the connecting rods ride the crankshaft on journal bearings. With the exception of the small size model 91 compressor, all compressor crankcases are lubricated by an automotive type oil pressure system. An automatically reversible gear type oil pump circulates oil through

Figure 1.3A: 107-Style Compressor Mounting

Figure 1.2A: Residual Vapor Recovery

6

Gasket

Adjustingscrew

Relief ball spring

Relief ball

Suction valveseat

Valve plate

SpacersWasher

Spacers

Washer

Valve spring

Suction valvepost

Suction valvebumper

Valve gasket

Gasket

Bolt

Discharge valvebumper

Valve spring

Valve plate

Discharge valveseat

Valve gasket

Suction ValveSpec 3

Discharge ValveAll Specs

passages in the crankshaft and connection rod to lubricate the journal bearings and wrist pins (see figure 1.3b). Sturdy iron crossheads transmit reciprocating motion to the piston.

Corkens automatically reversible oil pump design allows the machine to function smoothly in either direction of rotation.

Corken compressors use iron pistons that are locked to the piston rod. The standard piston ring material is a glass-filled PTFE polymer specially formulated for non-lubricated services. Piston ring expanders are placed behind the rings to ensure that the piston rings seal tightly against the cylinder wall.

Piston rod packing is used to seal the gas in the compression chamber and prevent crankcase oil from entering the compressor cylinder. The packing consists of several PTFE V-rings sandwiched between a male and female packing ring and held in place by a spring (see figure 1.3C).

The typical Corken compressor valve consists of a seat, bumper, one or more spring/s and one or more valve/s discs or plates as shown in figure 1.3d. Special heat-treated alloys are utilized to prolong life of the valve in punishing non-lubricated services. The valve opens whenever the pressure on the seat side exceeds the pressure on the spring side.

Figure 1.3D: Suction and Discharge Valves

Figure 1.3B: Pressure Lubrication System (Not Available on Model 91)

Figure 1.3C: Compressor Sealing System

7

2.1 LocationnOte: Compressor must be installed in a well ventilated area.

Corken compressors are designed and manufactured for outdoor duty. For applications where the compressor will be subjected to extreme conditions for extended periods such as corrosive environments, arctic conditions, etc., consult Corken. Check local safety regulations and building codes to assure installation will meet local safety standards.

Corken compressors handling toxic or flammable gases such as LPG/NH3 should be located outdoors. A minimum of 18 inches (45 cm) clearance between the compressor and the nearest wall is advised to make it accessible from all sides and to provide unrestricted air flow for adequate cooling.

nOise. Corken vertical compressors sizes model 91 through 891 should not exceed an 85 dbA noise level when properly installed.

2.2 foundationProper foundations are essential for a smooth running compression system. Corken recommends the compressor be attached to a concrete slab at least 8 in. thick with a 2 in. skirt around the circumference of the baseplate. The baseplate should be securely anchored into the foundation by 1/2 in. diameter J bolts 12 in. long. four bolts should be used for models 91, 291, and 491. six bolts should be used for model 691. The total mass of the foundation should be approximately twice the weight of the compressor system (compressor, baseplate, motor, etc.).

After leveling and bolting down baseplate, the volume beneath the channel iron baseplate must be grouted to prevent flexing of the top portion of the baseplate and the J bolt that extends beyond the foundation. The grout also improves the dampening capabilities of the foundation by creating a solid interface between the compressor and foundation.

On some of the longer baseplates, such as with the 691107, a 3 in. hole can be cut in the baseplate for filling the middle section of the baseplate with grout.

See Ed410 (Compressor Foundation design).

2.3 pipingProper piping design and installation is as important as the foundation is to

smooth operation of the compressor. Improper piping installation will result in undesirable transmission of compressor vibration to the piping.

dO NOT SuPPOrT PIPING WITH THE COMPrESSOr. unsupported piping is the most frequent cause of vibration of the pipe. The best method to minimize transmission of vibration from the compressor to the piping is to use flexible connectors (see figure 2.3A).

Pipe must be adequately sized to prevent excessive pressure drop between the suction source and the compressor as well as between the compressor and the final discharge point. In most cases, piping should be at least the same diameter as the suction nozzle on the compressor. Typically, LPG/NH3 liquid transfer systems should be designed to limit pressure drops to 20 psi (1.3 bar). Appendix d shows recommended pipe sizes for each compressor for typical LPG/NH3 installations.

Figure 2.2A: Recommended Foundation Details for Corken Compressors 91 - 691

2 min.ALL sides

8 min.

hex nut

WAsherCOmpressOrbAsepLAte

grOut beneAthbAse

COnCrete fOundAtiOn With reinfOrCements shOuLd be used On ALL mOdeLs

1/2 J bOLts12 LOng

nOte:LOCAte J bOLts per COmpressOr OutLine dimensiOn drAWings.

Ground levelConcretefoundation

Baseplate should bea maximum of 4 high

Groutedbaseplate

Pipe supportPipe support

Flexible connections Flexible connections

Figure 2.3A: On 107 mountings, the flexible connectors should be located near the four way valve.

Chapter 2installing Your Corken Compressor

8

Care must be taken if a restrictive device such as a valve, pressure regulator, or back-check valve is to be installed in the compressors suction line. The suction line volume between the restrictive device and the compressor suction nozzle must be at least ten times the swept cylinder volume.

107 style compressors are usually connected using a five-valve (figure 2.3b) or three-valve manifold (figure 2.3C). The five-valve manifold allows the storage tank to be both loaded and unloaded. The three-valve manifold only allows the storage tank to be loaded. Adequate sizing of the liquid and vapor lines is essential to limit the pressure drop in the system to a reasonable level (20 psi or less).

The line size helps determine the plant capacity almost as much as the size of the compressor, and liquid line sizes are a bigger factor than vapor lines. If the pressure gauges on the head indicate more than a 15 to 20 psi (2.07 to 2.40 bars) differential between the inlet and outlet pressures, the line sizes are too small or there is some fitting or excess flow valve creating too much restriction. The less restriction in the piping, the better the flow. Appendix d shows recommended pipe sizes for typical LPG/NH3 compressor installation.

A tank car unloading riser should have two liquid hoses connected to the car liquid valves. If only one liquid hose is used, the transfer rate will be slower and there is a good possibility that the cars excess flow valve may close.

Since the heat of compression plays an important part in rapid liquid transfer, the vapor line from the compressor to the tank car or other unloading container should be buried or insulated to prevent the loss of heat and the compressor should be located as near as possible to the tank being emptied. In extremely cold climates, if the line from the storage tank to the compressor is over 15 feet (4.6 meters) long, it should be insulated to lessen the possibility of vapors condensing as they flow to the compressor. The vapor recovery discharge line is better not insulated. Placing the compressor as close as possible to the tank being unloaded will minimize heat loss from the discharge line for the best liquid transfer rate.

unloading stationary tanks with a compressor is quite practical. delivery trucks and other large containers can be filled rapidly if the vapor system of the tank to be filled will permit fast vapor withdrawal, and if the liquid piping system is large enough. Many older trucks (and some new ones) are not originally equipped with vapor excess flow valves large

serviCe tO perfOrmvALve pOsitiOn

4-WAY A b C d e

1. unload Tank Car into Storage Tank

Position One Open Open Close Close Close

2. recover Vapors from Tank Car into Storage Tank

Position Two

Close Open Open Close Close

3. unload Transport or Truck into Storage Tank

Position One Open Close Close Close Open

4. recover Vapors from Transport or Truck into Storage Tank

Position Two Close Close Open Close Open

5. Load Truck or Field Tank from Storage Tank

Position Two

Open Close Close Close Open

6. Load Truck or Field Tank from Tank Car

Position One Close Open Close Open Close

7. Equalize between Tank Car and Storage Tank without using Vapor Pump

Open Open Close Open Open

8. Equalize between Truck or Field Tank and Storage Tank without using Vapor Pump

Open Close Close Open Close

Figure 2.3B: Five-Valve Manifold Piping System

9

enough to do a good job and these should be replaced by a suitable size valve. The liquid discharge should be connected to the tank truck pump inlet line rather than the often oversized filler valve connection in the tank head.

It is of extreme importance to prevent the entry of liquid into the compressor. The inlet of the compressor should be protected from liquid entry by a liquid trap (see section 2.4). It is of equal importance to protect the discharge of the compressor from liquid. This may be done by installing a check valve on the discharge and designing the piping so liquid cannot gravity-drain back into the compressor. Make sure to install a check valve on vapor lines discharging to the liquid space of the tank.

All piping must be in accordance with the laws and codes governing the service. In the united States, the following codes apply:

For LP Gas The National Fire Protection Association Pamphlet No. 58, Standard for the Storage and Handling of Liquefied Petroleum Gases.

For Ammonia The American National Standards Institute, Inc., K61.1-1989, Storage and Handling of Anhydrous Ammonia.

Copies of these are available from NFPA, 60 baterymarch Street, boston, Mass, 02110 and ANSI, 1430 broadway, New york, N.y., 10018. Install, use and maintain this equipment according to Corken instructions and all applicable federal, state, and local laws and previously mentioned codes.

2.4 Liquid trapsCompressors are designed to pressurize gas, not to pump liquids. The entry of even a small amount of liquid into the compressor will result in serious damage to the compressor.

On liquefied gas applications, a liquid trap must be used to prevent the entry of liquid into the compressor.

Corken offers three types of liquid traps for removal of entrained liquids. The simplest is a mechanical float trap (see figure 2.4A). As the liquid enters the trap the gas velocity is greatly reduced, which allows the entrained liquid to drop out. If the liquid level rises above the inlet, the float will plug the compressor suction. The compressor creates a vacuum in the inlet piping and continues to operate until the operator manually shuts it down. The trap must be drained and the vacuum-breaker valve opened before restarting the compressor, to allow the float to drop back. This type of trap is only appropriate for use where the operator keeps the compressor under fairly close observation. This trap is provided with the 109 and 107 compressor packages (see Appendix d for details on standard Corken compressor packages).

When the compressor will not be under more-or-less constant observation an automatic trap is recommended

Figure 2.4A: Mechanical Trap

Figure 2.3C: Three-Valve Manifold Piping System

serviCe tO perfOrmvALve pOsitiOn

4-WAy A b C1. unload Tank Car into

Storage TankPosition

OneOpen Open Close

2. recover Vapors from Tank Car into Storage Tank

Position Two

Close Open Open

10

(see figure 2.4b). The automatic trap replaces the float with electrical float switches. If the liquid level should rise too high, the level switch will open and disconnect the power to the motor starter, stopping the compressor. This design ensures the machine will be protected even when it is not under close observation and is standard in the 109A and 107A mounting configurations.

Corkens most sophisticated trap provides the most thorough liquid separation (see figure 2.4C). This trap is larger and is ASME code stamped. It contains two level switches, one for alarm and one for shutdown. In some cases the alarm switch is used to activate a dump valve (not included with trap) or sound an alarm for the trap to be manually drained by the operator. This trap also contains a mist pad. A mist pad is a mesh of interwoven wire to disentrain fine liquid mists. The ASME code trap is standard in the 109b and 107b mounting configurations.

A typical wiring diagram for the liquid level switch is shown in figure 2.4d.

nOte: the level switch must be removed from the trap before grounding any welding devices to the trap or associated piping! failure to do so will damage the switch contacts.

if your compressor is equipped with a liquid trap of other than Corken manufacture, make sure it is of adequate size to thoroughly remove any liquid entrained in the suction stream.

typical float switch Wiring diagram(1) = Common, black(2) = Normally closed, blue(3) = Normally open, red

Figure 2.4D: Typical Float Switch Wiring Diagram

Figure 2.4B: Automatic Liquid Trap Figure 2.4C: ASME Automatic Liquid Trap

11

Acceptable Crankcase Oil products for Corken Compressors

Constant Weight - Non-Detergent - R&O Inhibited

Oil product ISO VI SAE Ambient Temp.

ExxonTeressTic 100 95 30 65 - 100 F 68 95 20+ 45 - 70 F 46 95 20 35 - 50 FMobilrArUs 427 reciprocating 100 95 30 65 - 100 Fcompressor OilDTe Oil Heavy Medium 64 95 20+ 45 - 100 FDectol r&O Oil 44 95 20 35 - 50 FConocoDectol r&O Oil 100 98 30 35 - 50 F 68 97 20+ 45 - 70 F 46 99 20 35 - 50 FTexacoregal r&O Oil 100 92 30 65 - 100 F 68 97 20+ 45 - 70 F 46 102 20 35 - 50 FSunsunVis 900 Oil 100 100 30 65 - 100 F 68 100 20+ 45 - 70 F 46 100 20 35 - 50 F

Figure 2.6A: Oil Selection Chart

2.5 driver installation / flywheelsCorken vertical compressors may be driven by either electric motors or combustion engines (gasoline, diesel, natural gas, etc.). Corken compressors are usually V-belt driven but they are also suitable for direct drive applications as well. direct drive applications require an extended crankshaft to allow the attachment of a rigid metal coupling.

nOte: flexible couplings are not suitable for reciprocating compressors. never operate a reciprocating compressor without a flywheel.

drivers should be selected so the compressor operates between 350 to 825 rPM. The unit must not be operated without the flywheel or severe torsional imbalances will result that could cause vibration and high horsepower requirement. The flywheel should never be replaced by another pulley unless it has a higher wk2 value than the flywheel.

A humid climate can cause problems, particularly in explosion proof motors. The normal breathing of the motor, and alternating between being warm when running and being cool when stopped, can cause moist air to be drawn into the motor. This moist air will condense, and may eventually add enough water inside the motor to cause it to fail. To prevent this, make a practice of running the motor at least once a week on a bright, dry day for an hour or so without the V-belts. In this period of time the motor will heat up and vaporize the condensed moisture, driving it from the motor. No motor manufacturer will guarantee their explosion proof or totally enclosed (TEFC) motor against damage from moisture.

For installation with engine drivers, thoroughly review instructions from the engine manufacturer to assure the unit is properly installed.

2.6. Crankcase LubricationNon-detergent oil is recommended for Corken vertical compressors. detergent oils tend to keep wear particles and debris suspended in the oil, whereas non-detergent oils let them settle in the bottom of the crankcase. When non-detergent oils are not available, detergent oils may usually be successfully substituted, although compressors handling ammonia, amine, or imine gases are notable exceptions. These gases react with the detergent and cause the crankcase oil to become corrosive and contaminated. Figures 2.6A and 2.6b show recommended oil viscosities and crankcase capacities.

Synthetic lubricants are generally not necessary. Please consult your lubricate supplier if you are considering the use of synthetic oil.

2.7 relief valvesAn appropriate relief valve must be installed at the compressor discharge. On Corken 107-style mounted units a relief valve should be fitted in the piping between the compressor discharge and the four-way valve (see figure 1.3A). relief valves should be made of a material compatible with the gas being compressed. Local codes and regulations should be checked for specific relief valve requirements. Also, relief valves may be required at other points in the compressors system piping.

2.8 truck mounted CompressorsCorken compressors are may be mounted on trucks to perform liquid transfer operations as described in section 1.1. The compressor should be mounted so the inspection plate is accessible for packing adjustment. The compressor must be protected against liquid as explained in section 2.4 and a relief valve must be installed in the discharge piping before the first downstream shutoff valve.

Compressor model

Approximate Quarts

Capacity Liters

91 0.9 0.8

291 1.5 1.4

491 3.0 2.8

691 7.0 6.6

Figure 2.6B: Oil Capacity Chart

12

Three types of mountings are typically used. The inside mounting (figure 2.8A) drives the compressor directly off the PTO shaft. The PTO must be selected to drive the compressor between 400 and 800 rPM. An extended compressor crankshaft is required so the u-joint yoke may connect to the compressor without removing the flywheel. do not operate the compressor without a flywheel. use a u-joint with a splined joint and make sure the connections are parallel and in line. The u-joint angle should be less than 15 degrees (see figure 2.8b). Always use an even number of u-joints.

depending on the truck design, the compressor may be outside or top mounted as shown in figures 2.8C and 2.8d to be V-belt driven. Power is transmitted through a u-joint drive shaft, jackshaft with two pillow block bearings, V-belt sheave and V-belts. An idle pulley may be used under the truck frame.

2.9 shutdown/Alarm devicesFor many applications, shutdown/alarm switches will provide worthwhile protection that may prevent serious damage to your compressor system. All electronic devices should be selected to meet local code requirements. Shutdown/alarm devices typically used on Corken compressors are:

Low Oil Pressure Switch: Shuts down the unit if crankcase oil pressure falls below 12 psi due to oil pump failure or low oil level in crankcase.

High Temperature Switch: Shuts down the unit if the normal discharge temperature is exceeded. This is strongly recommended for all applications. Typically, the set point is about 30F (-1C) above the normal discharge temperature.

Low Suction, High discharge Pressure Switch: Shuts down the unit if inlet or outlet pressures are not within preset limits.

Vibration Switch : Shuts down the unit if vibration becomes excessive. recommended for units mounted on portable skids.

Figure 2.8A: Inside Transport Mounting

Figure 2.8B: U-joint Drive for Compressor

Figure 2.8C: Outside Transport Mounting

Figure 2.8D: Top Transport Mounting

13

Chapter 3starting up Your Corken Compressor

nOte: before initial startup of the compressor be sure the principal of using a compressor for liquid transfer by vapor differential pressure is understood (see section 1.1). read this entire chapter, then proceed with the startup checklist.

3.1 inspection After extended storageIf your compressor has been out of service for a long period of time, you should verify that the cylinder bore and valve areas are free of rust and other debris (see chapter 5 of this IOM manual for valve and/or cylinder head removal instructions).

drain the oil from the crankcase and remove the nameplate and crankcase inspection plate. Inspect the running gear for signs of rust and clean or replace parts as necessary. replace the crankcase inspection plate and fill crankcase with the appropriate lubricant. Squirt oil on the crossheads and rotate the crankshaft by hand to ensure that all bearing surfaces are coated with oil.

rotate unit manually to ensure running gear functions properly. replace nameplate and proceed with startup.

3.2 flywheel and v-belt Alignmentbefore working on the drive assembly, be sure that the electric power is disconnected. When mounting new belts, always make sure the driver and compressor are close enough together to avoid forcing.

Improper belt tension and sheave alignment can cause vibration, excessive belt wear and premature bearing failures. before operating your compressor, check alignment of the V-grooves of the compressor flywheel and driver sheave. Visual inspection often will indicate if the belts are properly aligned, but use of a square is the best method.

The flywheel is mounted on the shaft via a split, tapered bushing and three bolts. These bolts should be tightened in an even and progressive manner until torqued as specified below. There must be a gap between the bushing flange and the flywheel when installation is complete. Always check the flywheel runout before startup and readjust if it exceeds the value listed in Appendix C.

bushing sizediameterin. (cm)

bolt torqueft.-lb. (kg-meter)

SF 4.625 (11.7) 30 (4.1)

E 6.0 (15.2) 60 (8.3)

J 7.25 (18.4) 135 (18.7)

Tighten the belts so that they are taut, but not extremely tight. Consult your V-belt supplier for specific tension recommendations. belts that are too tight may cause premature bearing failure. refer to figure 3.2b.

3.3 Crankcase Oil pressure AdjustmentCorken compressor models 291 through 891 are equipped with an automatically reversible gear type oil pump (if your compressor is the splash lubricated Model 91, proceed to section 3.4). It is essential to ensure the pumping system is primed and the oil pressure is properly adjusted in order to assure smooth operation.

before starting your compressor, check and fill the crankcase with the proper quantity of lubricating oil.

When the compressor is first started, observe the crankcase oil pressure gauge. If the gauge fails to indicate pressure within 30 seconds, stop the machine.

Figure 3.2A: Flywheel Installation

Figure 3.2B: Belt Tension

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remove the pressure gauge. restart the compressor and run it until oil comes out of the pressure gauge opening. reinstall the gauge.

The oil pressure should be about 20 psi (1.4 bars) minimum for normal service. If the discharge pressure is above 200 psi (14.8 bars) the oil pressure must be maintained at a minimum of 25 psi (1.7 bars). A spring-loaded relief valve mounted on the bearing housing opposite the flywheel regulates the oil pressure. As shown in figure 3.3A, turn the adjusting screw clockwise to increase the oil pressure and counterclockwise to lower it. be sure to loosen the adjusting screw locknut before trying to turn the screw and tighten it after making any adjustment.

3.4 startup Check Listplease verify all of the items on this list before starting your compressor! failure to do so may result in a costly (or dangerous) mistake.

before starting the Compressor1. become familiar with the function of all piping associated

with the compressor. Know each lines use!

2. Verify that actual operating conditions will match the anticipated conditions.

3. Ensure that line pressures are within cylinder pressure ratings.

4. Clean out all piping.

5. Check all mounting shims, cylinder and piping supports to ensure that no undue twisting forces exist on the compressor.

6. Verify that strainer elements are in place and clean.

7. Verify that cylinder bore and valve areas are clean.

8. Check V-belt tension and alignment. Check drive alignment on direct drive units.

9. rotate unit by hand. Check flywheel for wobble or play.

10. Check crankcase oil level.

11. drain all liquid traps, separators, etc.

12. Verify proper electrical supply to motor and panel.

13. Check that all gauges are at zero level reading.

14. Test piping system for leaks.

15. Purge unit of air before pressurizing with gas.

16. Carefully check for any loose connections or bolts.

17. remove all stray objects (rags, tools, etc.) from vicinity of unit.

18. Verify that all valves are open or closed as required.

19. double-check all of the above.

After starting Compressor1. Verify and note proper oil pressure. Shut down and

correct any problem immediately.

2. Observe noise and vibration levels. Correct immediately if excessive.

3. Verify proper compressor speed.

4. Examine entire system for gas, oil or water levels.

5. Note rotation direction.

6. Check start-up voltage drop, running amperage and voltage at motor junction box (not at the starter).

7. Test each shutdown device and record set points.

8. Test all relief valves.

9. Check and record all temperatures, pressures and volumes after 30 minutes and 1 hour.

10. After 1 hour running time, tighten all head bolts, valve holddown bolts, and baseplate bolts. See Appendix C for torque values.

Figure 3.3A: Oil Pressure Adjustment

Oil Pressure Gauge

Oil Level Bayonet

Lock Nut

Oil PressureAdjusting

Screw

+-

Oil Pump Cover

15

Chapter 4routine maintenance Chart

item to Check daily Weekly monthlysix

monthsYearly

Crankcase oil pressure

Compressor discharge pressure

Overall visual check

Crankcase oil level 2 2

drain liquid from accumulation points 3

drain distance pieces

Clean cooling surfaces on compressor and intercooler (if any)

Lubricator supply tank level (if any)

Check belts for correct tension 1

Inspect valve assemblies

Lubricate motor bearings in accordance with manufacturers' recommendations

Inspect motor starter contact points

Inspect piston rings1 1 1

1 Piston ring life varies greatly, depending on application, gas, and operating pressures. Consult factory for additional recommendations for your specific application.

2 Change oil every 2,200 hours of operation or every 6 months, whichever occurs first. If the oil is unusually dirty, change it as often as needed to maintain a clean oil condition. Change replacement filter 4225 with every oil change.

3 Liquid traps should be drained prior to startup.

16

Chapter 5routine service and repair procedures

CAutiOn: Always relieve pressure in the unit before attempting any repairs. After repair, the unit should be pressure tested and checked for leaks at all joints and gasket surfaces.

If routine maintenance is performed as listed in chapter 4, repair service on your Corken gas compressor is generally limited to replacing valves or piston rings. When it comes time to order replacement parts, be sure to consult the part details appendix in the back of this Installation, Operation & Maintenance (IOM) manual for a complete list of part numbers and descriptions.

5.1 valvesTest the compressor valves by closing the inlet piping valves while the unit is running; however, do not allow the machine to operate in this way very long. If the inlet pressure gauge does not drop to zero almost immediately, one or more of the valves is probably either damaged or dirty. It is possible, of course, that the pressure gauge itself is faulty.

Inspect valves for breakage, corrosion, and scratches on the valve disc and debris. In many cases, valves may simply be cleaned and reinstalled. If the valves show any damage, they should be repaired or replaced. replacement is usually preferable, although individual parts are available. If valve discs are replaced, seats should also be lapped until they are perfectly smooth. If more than .005 in. must be removed to achieve a smooth surface, the valve should be discarded. If discs are replaced without relapping the seat, rapid wear and leakage may occur.

Each suction and/or discharge valve assembly is easily removed as a unit for inspection. If any part of the valve assembly is broken, the valve assembly should be replaced. See valve assembly parts details in the appendices for a complete list of part numbers and descriptions.

If a valve is leaking due to dirt or any other foreign material that keeps the valve plate and seat from sealing, the valve may be cleaned and reused. New gaskets and/or O-rings should be used to assure a good seal.

The valve holddown assemblies and valve assemblies on the following pages show the various specifications used on models 91, 291, 491, 691 and 891 compressors. Since more than one suction valve arrangement is available for each model of compressor, it is necessary to know your complete model number so you can identify the valve type specification number (see example listed below). In most cases for liquid transfer and/or vapor recovery compressors, the valve type will be spec. 3.

Model number 491AM 3 FbANSNN

Valve type = spec 3

valve holddown Assemblies: depending on your model of compressor, the valve holddown assembly has all or a combination of the following:

1. Valve cap

2. Valve cap O-ring

3. Holddown screw

4. Valve cover plate

5. Valve cover plate bolts

6. Valve cover plate O-ring

7. Valve spacer (model 491 only)

8. Valve cage

9. Valve assembly

10. Valve gasket

valve Assemblies: depending on your valve specification, the valve assembly has all or a combination of the following:

1. Gasket

2. Adjusting screw

3. relief ball spring

4. relief ball

5. Valve seat

6. Valve plate

7. Spacers

8. Washer

9. Valve spring

10. Suction valve post

11. Valve bumper

12. Valve gasket

See valve holddown and valve assembly part details in the appendix for a complete list of part numbers and descriptions.

valve inspection and/or replacement for models 91 and 291 Compressorsbefore removing and inspecting the valves, begin by depressurizing and purging (if necessary) the unit.

17

disassembly1. unscrew the valve cap and remove O-ring.

2. With the special wrench supplied with your compressor at time of purchase, remove the holddown screw.

3. After the holddown screw has been removed, the valve assembly and valve gasket can be lifted out.

4. Carefully inspect for dirt or broken/damaged parts.

5. Inspect valves for breakage, corrosion, debris and scratches on the valve disc or plate. In many cases, valves may simply be cleaned and reinstalled. If the valves show any damage, they should be repaired or replaced. replacement is usually preferable although repair parts are available. If valve plates are replaced, seats should also be lapped until they are perfectly smooth. If more than .005 in. must be removed to achieve a smooth surface, the valve should be discarded. If plates are replaced without relapping the seat, rapid wear and leakage may occur.

Assembly1. Insert metal valve gasket into the suction and/or discharge

opening of the head. The metal valve gasket should always be replaced when the valve is reinstalled.

2. Insert cleaned or new valve assembly. Make sure the suction and discharge valves are in the proper suction and discharge opening in the head. NOTE: The spec 3 suction valves for a model 91 and 291 compressor are pre-set so no adjustments to liquid relief pressure are necessary.

3. replace the holddown screw and tighten to the value listed in Appendix C to ensure the valve gasket is properly seated. NOTE: Gaskets and O-rings are not normally reusable.

4. replace the O-ring (or gasket) and valve cap and tighten to the value listed in Appendix C. O-rings sealing the valve caps should be replaced.

5. Check bolts and valve holddown screws after first week of operation. re-torque if necessary. See Appendix C for torque values.

valve inspection and/or replacement for models 491, 691 and 891 Compressorsbefore removing and inspecting the valves, begin by depressurizing and purging (if necessary) the unit.

disassembly1. unscrew the valve cap/nut and remove the gasket

from the coverplate.

2. remove the valve cover plate, O-ring and holddown screw by removing each of the four bolts. NOTE: Since

the holddown screw has been secured with an impact wrench at the factory, you will probably need to wait to remove the holddown screw until after the cover plate has been removed. At this point in time, the holddown screw can be easily removed from the cover plate. The holddown screw on model 691 and 891 is most easily removed with the special wrench supplied with your compressor at time of purchasing.

3. After the cover plate and O-ring have been removed, the valve spacer (model 491 only), valve cage, valve assembly and valve gasket can be lifted out.

4. Inspect valves for breakage, corrosion, debris and scratches on the valve plate. In many cases, valves may simply be cleaned and reinstalled. If the valves show any damage, they should be repaired or replaced. replacement is usually preferable although repair parts are available. If valve plates are replaced, seats should also be lapped until they are perfectly smooth. If more than .005 in. must be removed to achieve a smooth surface, the valve should be discarded. If plates are replaced without relapping the seat, rapid wear and leakage may occur.

Assembly1. Insert metal valve gasket into the suction and/or discharge

opening of the head. The metal valve gasket should always be replaced when the valve is reinstalled.

2. Insert cleaned or new valve assembly. Make sure the suction and discharge valves are in the proper suction and discharge opening in the head.

3. Insert the valve cage and valve spacer (NOTE: spacer applies to model 491 compressor only).

4. replace the O-ring and valve cover plate. Torque bolts to the value listed in Appendix C. CAuTION: be sure the holddown screw has been removed.

5. Insert the holddown screw and tighten to the value listed in Appendix C to ensure the valve gasket is properly seated. NOTE: Gaskets and O-rings are not normally reusable.

6. replace the O-ring (or gasket) and valve cap/nut and tighten to the value listed in Appendix C. O-rings sealing the valve cap should be replaced if they show signs of wear or damage. Valve caps sealed by flat metals gaskets should be reinstalled with new gaskets.

7. NOTE: Spec 3 suction valves have an adjusting screw to set the liquid relief pressure. To set the liquid relief pressure, tighten the adjusting screw until it bottoms, then back out 3/4 turn.

8. Check bolts and valve holddown screws after first week of operation. re-torque if necessary. See Appendix C for torque values.

18

5.2 headsA compressor head very seldom requires replacement if the compressor is properly maintained. The primary cause of damage to a head is corrosion and the entry of solid debris or liquid into the compression chamber. Improper storage can also result in corrosion damage to the head (for proper storage instructions see chapter 6).

Many compressor repair operations require removal of the head. While the compressor is disassembled, special care should be taken to avoid damage or corrosion to the head. If the compressor is to be left open for more than a few hours, bare metal surfaces should be coated with rust preventative.

When reassembling the compressor, make sure the bolts are retightened as shown in Appendix C.

5.3 piston rings and piston ring expanders

Figure 5.3A: Piston Removal

Piston ring life will vary considerably from application to application. ring life will improve dramatically at lower speeds and temperatures.

1. To replace the piston rings, depressurize the compressor and purge if necessary.

2. remove the head to gain access to the compressor cylinder.

3. Loosen the piston head bolts. remove the piston as shown in figure 5.3A by pinching two loose bolts together.

4. Piston rings and expanders may then be easily removed and replaced. Corken recommends replacing expanders whenever rings are replaced. To determine if rings should be replaced, measure the radial thickness and compare it to the chart in Appendix C.

5.4 pistons1. To replace the pistons, depressurize the compressor

and purge if necessary.

2. remove the compressor cylinder and head (see section 5.2).

3. remove the piston head by loosening and removing the socket head bolts holding the piston head to the piston platform (see figure 5.3A).

4. Next, remove the roll pin with a pair of needle nose pliers. The castellated nut may then be removed and the piston platform lifted off the end of the piston rod.

5. Check the thrust washer and shims for damage and replace if necessary.

6. before installing the new piston, measure the thickness of the existing shims. For Models 91 through 491, the shims are placed between the thrust washer and piston platform. For model 691, the shims are placed between the platform and piston head (see figures 5.4A and 5.4b).

7. reinstall the piston platform with the same thickness of shims as before, but dO nOt reinstALL the rOLL pin.

8. replace the cylinder and install the piston heads with new piston rings and expanders.

9. Now measure dimension X shown in the illustration. If this measurement does not fall within the tolerances shown in Appendix C, remove the piston, adjust the shims as necessary and remeasure the X dimension.

10. When the piston is properly shimmed, tighten the castellated nut as shown in Appendix C.

11. Now install a new roll pin to lock the castellated piston nut in place.

Figure 5.4A: Piston Cross SectionModel Sizes 91 Through 491

19

Figure 5.4B: Piston Cross SectionModel 691

12. Install the piston head and tighten the socket head bolts in an alternating sequence.

13. reinstall the head (see section 5.2) and follow standard startup procedure. (Note: Some compressors may have self-locking nuts without roll pins.)

5.5 piston rod packing AdjustmentPiston rod packing should be adjusted or replaced whenever leakage becomes noticeable. Typically, it is a good idea to replace piston rod packing and piston rings at the same time. For instructions on adjusting and replacing the piston rod packing, see section 5.6.

NOTE: Inspection of the rod packing is generally not productive, since packing that cannot be adjusted to an acceptable leakage rate should be replaced.

Figure 5.5A: Packing Adjusting Nuts

5.6 Cylinder and packing replacementCylinders very seldom require replacement if the compressor is properly maintained. The primary cause of damage to cylinders is corrosion and the entry of solid debris or liquid into the compression

chamber. Improper storage can also result in corrosion damage to cylinder (for proper storage instructions see chapter 6).

If the cylinder does become damaged or corroded, use a hone to smooth the cylinder bore and then polish it to the value shown in Appendix C. If more than .005 in. must be removed to smooth the bore, replace the cylinder. Cylinder liners and oversized rings are not available. OVErbOrING THE CyLINdEr WILL rESuLT IN GrEATLy rEduCEd rING LIFE.

Many compressor repair operations require removal of the cylinder. While the compressor is disassembled, special care should be taken to avoid damage or corrosion to the cylinder. If the compressor is to be left open for more than a few hours, bare metal surfaces should be coated with rust preventative.

When reassembling the compressor, make sure the bolts are retightened as shown in Appendix C.

packing replacement instructionsCaution: bleed all pressure from the compressor and piping, and purge (if necessary), before starting to install new piston rod packing. After repair, the unit should be pressure tested and checked for leaks at all joints and gasket surfaces. When the compressor is being used with toxic, dangerous, flammable or explosive gases, this pressure and leak testing should be done with air or a dry, inert gas such as nitrogen.

For simplicity, heads, pistons, and inspection plates are not shown. For specific construction details and actual part numbers, consult the appendix in the back of this IOM manual. use instructions below that apply to the MOdEL and SErIAL NuMbEr of your compressor. be careful to arrange packing sets in the proper order.

Cleanliness:Sealing a reciprocating piston rod is a very difficult task. Keep all parts, tools and your hands clean during installation. your new packing needs every chance it can get, so keep it clean.

Workmanship:your Corken compressor is a precision piece of equipment with very close tolerances. Treat it as such. Never beat on it to get parts in or out.

model 91 Compressor(refer to Appendix G for packing assembly details)

disassembly of packing1. depressurize and open the compressor.

2. remove head, piston, cylinder, inspection plate and crosshead guide.

20

3. Loosen adjusting screw and remove retainer ring, washers, packing spring and old packing from crosshead guide.

Assembly of packing1. Clean, then lightly oil, packing area inside the

crosshead guide.

2. Slightly thread in the adjusting screw into the crosshead guide.

3. Install packing rings including male and female packing rings one at a time as shown in Appendix G. Push in each one completely before adding the next ring. The quantity of packing rings required will vary due to tolerances; a good rule of thumb is to put in as many as are removed.

4. Insert thin packing box washer, packing spring and thicker washer into the top of the crosshead guide.

5. Tighten adjusting screw until plastic locking device engages the first thread in the crosshead guide.

6. Oil piston rod and install the packing installation cone (part number 4005) over the threaded end of the piston rod.

7. Carefully slip the crosshead guide over the piston rod; otherwise, you may damage the lips of the packing rings.

8. remove packing installation cone.

9. Install the crosshead guide O-ring, cylinder, piston and head.

model 291 Compressor (serial no. ss55685 and later)model 491 Compressor (serial no. xC30633 and later)(refer to Appendix H or I for packing assembly details)


2. remove head, pistons and cylinder.

3. remove cartridge holddown screw with special wrench supplied with the compressor and packing box cartridge.

4. Loosen adjusting screw and remove retainer ring, washers, packing spring and old packing from packing box cartridge.

Assembly of packing1. Clean, and then lightly oil, packing area inside packing

box cartridge.

2. Slightly thread in adjusting screw.

3. Install packing rings including male and female packing rings, one at a time, as shown in Appendix H or I. Push in each one completely before adding the next ring. The quantity of packing rings required will vary due to tolerances; a good rule of thumb is to put in as many as are removed.

4. Insert thin packing box washer, packing spring and thicker washer.

5. Push down on washer and insert retainer ring.

6. Tighten adjusting screw until plastic locking device engages the first thread in the packing box cartridge.

7. Oil piston rod and replace cartridge O-ring.

8. Install packing installation cone part number 4005 over the threaded end of the piston rod.

9. Carefully slip the packing cartridge over the piston rod; otherwise, you may damage the lips of the packing rings.

10. remove packing installation cone.

11. Install and tighten cartridge holddown screw with special wrench.

12. Install cylinder O-ring, cylinder, pistons and head.

model 691 Compressor(refer to Appendix J for packing assembly details)


2. remove head, pistons and cylinder.

3. remove cartridge holddown screw with special wrench supplied with the compressor and packing box cartridge.

4. Loosen adjusting screw and remove retainer ring, washers, packing spring and old packing from packing box cartridge.

Assembly of packing1. Clean then lightly oil packing area inside packing box

cartridge.

2. Thread in adjusting screw until locking device is engaged into first thread of the packing cartridge.

3. Install packing rings, including male and female packing rings, one at a time, as shown in Appendix J. Push in each one completely before adding the next ring.

21

4. Insert a packing washer, packing spring and another packing washer.

5. Push down on washer and insert retainer ring.

6. Oil piston rod and replace cartridge O-ring.

7. Install packing installation cone part number 3905 over the threaded end of the piston rod.

8. Carefully slip the packing cartridge over the piston rod; otherwise, you may damage the lips of the packing rings.

9. Install and tighten cartridge holddown screw with special wrench.

10. replace cylinder O-ring, cylinder, pistons and head.

model d891 Compressor(refer to Appendix K for packing assembly details)


2. remove the cylinder cap, heads, pistons and cylinder.

3. To remove the packing barrels, pry upward under each one and lift entire barrel/cartridge assembly up from piston rod.

4. remove the four socket head screws that hold the packing cartridge to the barrel.

Assembly of packing1. replace packing as required. The segmented packing

and cups are in the barrel. The V-ring packing is in the cartridge. Note the arrangement of the particular packing set for the model machine you have.

2. reattach the cartridges to the barrels using the four socket head screws.

3. Install cartridge barrel assemblies, noting the alignment of the barrels as they sit on the crosshead guide. The valve scallops on the barrels must align properly with the valves of the cylinder.

4. replace cylinder, pistons, heads and cap. See piston assembly details for proper clearance values.

5. rotate unit by hand to ensure proper assembly.

5.7 bearing replacement for Crankcase and Connecting rod1. To replace the crankcase roller bearings, wrist pin

bushing and connecting rod bearings, begin by

removing the head, cylinder, piston, crosshead guide and crosshead assembly.

2. drain the crankcase and remove the inspection plate(s).

3. before disassembly, choose and mark one connecting rod and the corresponding connecting rod cap. dO NOT MIX CONNECTING rOdS ANd CAPS. Loosen and remove the connecting rod bolts in order to remove the crosshead and connecting rod assembly.

5.7.1 Wrist pin bushing replacement1. To replace the wrist pin bushing, remove the retainer

rings that position the wrist pin in the crosshead.

2. Press out the wrist pin so the crosshead and connecting rod may be separated. Inspect the wrist pin for wear and damage and replace if necessary.

3. Press out the old wrist pin bushing and press a new bushing into the connecting rod. dO NOT MACHINE THE O.d. Or I.d. OF THE buSHING bEFOrE PrESSING INTO CONNECTING rOd.

4. Make sure the lubrication hole in the bushing matches the oil passage in the connecting rod. If the holes do not align, drill out the bushing through the connecting rod lubricant passage with a long drill. bore the wrist pin bushing I.d. as indicated on the respective connecting rod assembly details. These pages are located in the appendices. Over boring the bushing can lead to premature failure of the wrist pin bushing.

5. Inspect the oil passage for debris and clean thoroughly before proceeding.

6. Press the wrist pin back into the crosshead and wrist pin and reinstall retainer rings. NOTE: The fit between the wrist pin and bushing is tighter than ordinary lubricated air compressors and combustion engines.

5.7.2 replacing Connecting rod bearingsConnecting rod bearings are easily replaced by removing the semicircular bearings. Make sure the indentations in the connecting rod bearing and connecting rod line up when installing the new bearings. MAKE SurE THE ArrOW ANd/Or ALIGNMENT NOTCH ON CONNECTING rOd ANd CAP ArE ALIGNEd.

before reinstalling the crosshead/connecting rod assembly, make sure the crankshaft throw and bearing surface are clean and lubricated. Tighten the connecting rod bolts to the torques listed in Appendix C.

5.7.3 replacing Crankcase roller bearingsTo inspect the roller bearings, remove the flywheel from the crankshaft and then remove the bearing carrier and crankshaft from the crankcase. If corrosion or pitting is

22

present, the roller bearings should be replaced. When replacing roller bearings, always replace the entire bearing, not just the cup or the cone.

1. To replace the bearings, press the cups out of the crankcase and bearing carrier and press the cones off the crankshaft.

2. Press the new bearings into position and reassemble the crankshaft and bearing carrier to the crankcase. When reinstalling the bearing carrier, make sure the oil pump shaft slot is aligned with the pin in the crankshaft. Make sure to install the bearing carrier gasket so the oil passage hole is not blocked (see figure 5.6.3A).

3. In order to check the crankshaft endplay, the oil pump must first be removed (see section 5.8).

4. Press the end of crankshaft towards the crankcase; if a clicking noise or motion is detected, the crankshaft has too much endplay. See Appendix C.

5. To reduce endplay, remove the bearing cover and remove a thin shim. recheck the endplay after replacing the bearing cover.

6. When there is no detectable endplay, the shaft must still be able to rotate freely. If the crankshaft sticks or becomes abnormally warm, then the crankshaft bearings are too tight. If the crankshaft is too tight, add more shims, but make sure not to over shim. (Appendix C lists the proper crankshaft endplay). When the crankshaft can be rotated freely by hand with proper endplay, the rest of the compressor may be reassembled. If the crankshaft roller bearings are too tight or too loose, premature bearing failure will result.

7. reinstall the flywheel on the crankshaft and check the run out as shown in Appendix C.

5.8 Oil pump inspectionIf the compressor operates for a prolonged period with dirty or contaminated crankcase oil, damage to the oil pump may result.

1. To check the oil pump, unbolt the pump cover and remove the oil pump, spring guide, spring and oil pump shaft adapter as shown in figure 5.8A.

2. Inspect the gears in the oil pump for corrosion or pitting and replace if necessary.

3. Check the oil pump shaft bushing in the bearing carrier. If the bushing is corroded, pitted or worn, the oil pump shaft bushing should be replaced.

4. before reassembling the oil pump mechanism, replace the O-rings in the oil pump cover and on the oil pump adapter shaft (see figure 5.8A).

5. rotate the drive pin in the crankshaft to a vertical position for easiest reassembly.

6. Insert the shaft adapter so it engages the drive pin.

7. Next, insert the spring, spring guide and oil pump assembly. The tang on the oil pump must align with the slot in the shaft adapter.

8. Install the pump cover so the pin on the case is in the opening on the oil pump assembly as shown in figure 5.8A. When you are sure the pin is properly aligned, install the cover bolts finger tight.

9. rotate the crankshaft by hand to ensure smooth operation. Then rotate it in opposite directions, listening for a click, which indicates proper alignment of the oil pumps pins and slots.

10. Finally, tighten the bolts in an alternating sequence. See section 3.3 for directions on oil pressure adjustment.

Figure 5.6.3A: Bearing Carrier Replacement

23

1. remove the hex nut, indicator plate and handle from the rotor shaft.

2. remove the four hex head bolts and the cap from the body. The cap should be rotated until free; do not pry. Inspect cap for wear and damage (see figure 5.9C).

5.9 servicing the four-Way valveunlike older units, new Corken compressors mounted in the 107 arrangement are being supplied with a non-lube four-way valve. No maintenance is normally required on this valve. If you have reason to disassemble the valve, please follow the instructions below (see figures 5.9A and 5.9b).

CAutiOn: Always relieve pressure in the unit before Attempting Any repairs.

before disassembly:1. record the position marks on the end of the rotor shaft.

2. record the positions of the handle stops on the cap.

nOte: A small amount of silicone grease applied to each part before assembly facilitates assembly if allowed.

disassemblyrefer to the drawing for item description.

Figure 5.9A

Figure 5.8A

Figure 5.9B

24

Figure 5.9C

3. remove the body O-ring, stem O-ring, cap O-ring, and top rotor washer and discard.

4. remove the rotor and four seals as a unit from the body. impOrtAnt: because of the close tolerance, care must be taken to remove the rotor on its axis to prevent damage to the rotor and body. rotating the handle with a lifting action will help remove the rotor as shown in figure 5.9d.

Figure 5.9D

5. discard the four seals. Inspect the rotor for wear and damage.

6. remove the bottom rotor washer and discard. Inspect the body for wear and damage.

Assemblyrefer to figure 5.9b. Have the repair kit laid out.

1. Place the new bottom rotor washer into the body.

2. Assemble the four seals and O-rings onto the appropriate surfaces of the rotor.

3. Assemble the rotor and seal assembly into the body. impOrtAnt: because of the close tolerance, care must be taken to press the rotor on its axis to prevent damage to the rotor and body. A ring compressor is helpful. be sure that the rotor is bottomed in the body.

4. rotate the rotor so that the position marks on the end of the rotor shaft are the same as recorded before disassembly.

5. Assemble the new top rotor washer and cap O-ring, onto the shoulder of the rotor.

6. Assemble the new stem O-ring and the body O-ring into their grooves in the rotor and body.

7. Place the cap over the rotor shaft.

8. rotate the rotor so the position of the handle stops on the cap is the same as recorded before disassembly.

9. Assemble the four hex head bolts through the cap and into the body. be sure that the body O-ring is in the proper position and tighten the hex head bolts.

10. reassemble the handle, indicator plate and hex nut. be sure that the handle is assembled so that the stop on the handle mates with the stops on the cap.

Chapter 6 extended storage proceduresFollowing a few simple procedures will greatly minimize the risk of the unit becoming corroded and damaged. Corken recommends the following precautions to protect the compressor during storage:

1. drain the crankcase oil and refill with rust inhibiting oil.

2. Operate for a few minutes while fogging oil into the compressor suction.

3. relieve V-belt tension.

4. Plug all openings to prevent entry of insects and moisture. (The cylinders may also be protected by the use of a vapor phase inhibitor, silica gel, or dry nitrogen gas. If the silica gel is used, hang a tag on the unit indicating that it must be removed before start-up.)

5. Store in a dry area, off the ground if possible.

6. rotate the flywheel every two weeks if possible.

25

part number 3549-x1 3550-x1 3551-x1 3552-x1 3552-x2 5578-x2A

model number 90J3, 91J3 290K3, 291m3 490K3, 491m3 690K3, 690p3 690m3, 691m3 891m3

Suction valve assembly 3483-1X 3483-1X (2)2 2532-1X 3948-X (2)2 3948-X (2)2 3732-X

discharge valve assembly 3485-X 3485-X (2)2 2439-X (2)2 3857-X (2)2 3857-X (2)2 3733-X

Valve cage 2448 (4)2 2797 (4)2 2797 (4)2

Connecting rod bearing (pair) 1367 1367 (2)2 1491 (2)2 1719 (2)2 3542 (2)2 3542 (2)2

Packing set 1452-1X1 1452-1X1 (2)2 1452-1X1 (2)2 1725-2X (2)2 1725-2X (2)21725-2X, 3810-X1

Piston rings 1772 (3)2 1772 (6)2 1773 (6)2 1739 (6)2 1739 (6)2 1739 (8)2

ring expanders 1775 (3)2 1775 (6)2 1776 (6)2 1740 (6)2 1740 (6)2 1740 (8)2

Gasket set1 2526-XA1 1281-XA1 1481-X6A1 1744-X1A1 1744-X1A1 3970-X1A

O-ring1 2-261A (2)1, 2

O-ring1 2-242A (2)1, 2

O-ring1 2-253A (2)1, 2

Oil seal 3259 1278 1507 (490 only) 3526 3526

Oil seal 4438 (491 only)

Adapter plate gasket 1486 1 All repair kits are furnished with Buna-N O-rings which are suitable for LPG and NH3 applications2 Quantities larger than 1 are shown in parenthesis

model 91 gasket set (2526-xA)gasket sets

model 291 gasket set (1281-xA)part number

description Quantity

2-235A O-ring, buna-N 2

2526 Crankcase gasket 1

2717 Valve gasket, aluminum 2

2729 Crankcase inspection plate gas 1


2244 Inspection plate gasket 1

2716 Valve cap gasket, aluminum 2

2725 bearing carrier gasket 1

part number


1281 Filter screen screw gasket 1






2732 Center headbolt gasket - steel 2

1190 Adapter plate gasket 2







Appendix Arepair Kits and gasket sets

description trim part number Connection sizes

Four-Way Valve repair Kits PTFE and buna-N trim

3122-X 1"

3123-X 1"

3130-X 2"

four-Way valve repair Kits

Compressor repair Kits

26

model 491 gasket set (1481-x6A) model 691 gasket set (1744-x3A)

model 891 gasket set (3970-x1A)

part number



1480 Center headbolt gasket - steel 2






1478 Valve cap gasket, steel 4

1481 Head gasket 1





part number










4127 Lubricator gasket 1







2129 Oil inlet gasket 1

2177 Flange gasket 2

3874 Access cover gasket 2part number









4127 Lubricator gasket 1







3874 Access cover gasket 2

3906 Gasket spiral wound 2

Appendix Arepair Kits and gasket sets (continued)

27

model numberbase x x x x x x x x x x

Valves Liquid relief suction Standard 3

Standard valves No extra cost 4

1 Registered trademark of the DuPont company.See Appendix D for mounting options.

Appendix b vertical single-Acting model number identification Code

Splash lubricated Standard N/A N/A N/A J

Extended crankshaft Extra cost Extra cost Extra cost N/A ECrankcase Style

Pressure lubricated N/A Standard Standard Standard M

Standard with heater N/A Extra cost Extra cost Extra cost MH

base Model 91 291 491 691

Inlet 3/4" NPT 3/4" NPT 1-1/4" NPT 2" NPT

Outlet 3/4" NPT 3/4" NPT 1-1/4" NPT 1-1/2" NPT

base Model F91 F291 F491 F691

Inlet 3/4" ANSI 3/4" ANSI 1-1/4" ANSI 2" ANSI

Outlet 3/4" ANSI 3/4" ANSI 1-1/4" ANSI 2" ANSI

Piston rings and Packing PTFE Standard F

Alloy 50 Extra Cost G

Aluminum Standard b

Gasket Material Copper No extra cost C

Lead-iron No extra cost d

buna-N Standard A

O-ring Material Neoprene1 No extra cost b

Viton1 Extra cost d

PTFE Extra cost E

Intercooler None N/A for single stage compressor N

14" flywheel used with No charge N/A E

extended crankshaft

Flywheel Heavy duty Extra cost Extra cost Extra cost Extra cost H

No flywheel No extra cost N Standard flywheel Standard S

Protective Coating No coating Standard N

Piston rod Coating Nitrotec Standard N

Chrome oxide Extra cost C

Packing Arrangement Pressurized inlet Standard A

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103 mounting includes: Steel baseplate, adjustable driver slide base, V-belt drive and enclosed steel belt guard. Pressure gauges are

mounted on the compressor.3

107 mounting includes: Steel baseplate, mechanical liquid trap, non-lube 4-way valve, interconnecting piping, strainer, adjustable driver slide

base, V-belt drive and enclosed steel belt guard. Pressure gauges are mounted on the compressor.

107A mounting includes: All items on the 107 replacing the mechanical float in the liquid trap with a NEMA 7 liquid level switch.

107b mounting includes: All items on the 107 replacing the liquid trap with a larger ASME code liquid trap with 2 NEMA 7 liquid level

switches set for alarm and shutdown.

107tr mounting includes: All items on the 107 set up to be used as a transport unit. Note that the compressor must have the optional 14

flywheel and extended crankshaft to use this mounting.2

109 mounting includes: Steel baseplate, mechanical liquid trap, interconnecting piping, adjustable driver slide base, V-belt drive and

enclosed steel belt guard. Pressure gauges are mounted on the compressor.3

109A mounting includes: All items on the 109 replacing the mechanical float in the liquid trap with a NEMA7 liquid level switch.3

109b mounting includes: All items on the 109 replacing the liquid trap with a larger ASME code liquid trap with 2 NEMA 7 liquid level

switches set for alarm and shutdown.3

109tr mounting includes: All items on the 109 set up to be used as a transport unit. Note the compressor must have the optional 14

flywheel and extended crankshaft to use this mounting.2,3

mounting selections

2 Not suitable for 691 or D891.3 Discharge relief valves are required but not included in these mountings.

1 Registered trademark of the DuPont company.

Appendix b vertical double-Acting model number identification Code

base Model Number d891

Inlet Connection 2" Weld

Outlet Connection 2" Weld

Ship Weight (lb) 900

Packing Packing arranged for padding of distance piece Standard JArrangement

Crankcase Pressure lubricated Standard MStyle Standard with heater Extra cost MH

Valves Standard suction and discharge valves Standard 4

Suction valve unloaders Extra cost 9

Piston ring and Packing PTFE Standard F Material

Gasket Material Aluminum Standard b

O-ring buna-N Standard AMaterial Neoprene1 No charge b

Intercooler N/A for single stage compressor Standard N

Flywheel No flywheel provided No charge N

Standard flywheel Standard S

Protective None Standard N

Coating

Piston rod Nitrotec Standard N

Coating

model numberbase x x x x x x x x x x

29

Appendix Cvertical single-Acting specifications

Single-acting, vertical, reciprocating piston type vapor compressorSingle packed rodNPT or 300# ANSI connections

equipment type & Options

bulk transferVapor recoveryTank evacuationGas scavenging

Applications

Self-lubricating piston rings: Non-lubricated operation to minimize oil in gasNPT or 300# ANSI connections: Versatility for your applicationMultiple mounting configurations: Versatility for your applicationHigh efficiency valves: Quiet, reliable operationreversible oil pump: Allows operation in either directionSimplified top down design: routine maintenance is minimally invasive

features and benefits

specificationmodel number

91 291 491 691bore of cylinder inches (mm) 3.0 (76.2) 3.0 (76.2) 4.0 (101.6) 4.5 (114.3)Stroke inches (mm) 2.5 (63.5) 2.5 (63.5) 3.0 (76.2) 4.0 (101.6)Piston displacement cfm (m3/hr) minimum @ 400 rPM maximum @ 825 rPM

4.0 (6.8)8.3 (14.1)

8.0 (13.6) 16.5 (28.0)

17.2 (29.2) 35.5 (60.3)

29.2 (49.6) 60.2 (102.3)

Maximum working pressure psig (bar g)1 335 (23.1)Maximum brake horsepower (kW) 7.5 (5.6) 15 (11) 15 (11) 35 (26.1)Maximum rod load lb (kg) 3,600 (1,632.9) 3,600 (1,632.9) 4,000 (1,814.4) 7,000 (3,175.1)Maximum outlet temperature F (C) 350 (177)bare unit weight lb (kg) 115 (52.2) 160 (72.6) 260 (117.9) 625 (283.5)Maximum flowpropane gpm (m3/hr) 50 (11.4) 101 (22.9) 215 (48.8) 361 (82.0)

specifications

models 91691

1 These numbers specify pressure-containing abilities of the compressor cylinder and head. For many applications, factors other than the pressure rating will limit the maximum allowable discharge pressure to lower values. These factors include horsepower, temperature and rod load.

30


part model standard material Optional materialHead, Cylinder All ductile iron ASTM A536 NoneCrosshead guide crankcase, flywheel, bearing carrier

All Gray iron ASTM A48, Class 30 None

Flange 691 ductile iron ASTM A536 Steel weld flange

Valve seat & bumper91, 291 17-4 PH stainless steel491 ductile iron ASTM A536 None691 17-4 PH stainless steel

Valve plate91, 291 410 stainless steel491 17-7 PH stainless steel None691 410 stainless steel

Valve spring91, 291, 691 17-7 PH stainless steel None491 Inconel

Valve gaskets All Soft aluminum Iron-lead, CopperPiston All Gray iron ASTM A48, Class 30 NonePiston rod All C1050 steel Nitrotec coated Chrome oxideCrosshead All Gray iron ASTM 48, Class 30 NonePiston rings All PTFE, glass and moly filled Alloy 50ring expanders All 302 stainless steel NoneHead gasket All O-ring, buna-N PTFE, Viton1, Neoprene1

Packing cartridge, connecting rod

All ductile iron ASTM A536 None

Packing rings All PTFE, glass and moly filled Alloy 50Crankshaft All ductile iron ASTM A536 NoneCon. rod bearing All bimetal d-2 babbit NoneWrist pin All C1018 steel NoneWrist pin busing All bronze SAE 660 NoneMain bearing All Tapered roller NoneInspection plate All Aluminum NoneO-rings All buna-N PTFE, Viton1, Neoprene1

retainer rings All Steel NoneMisc. gaskets All Coroprene None

models 91691 material specifications

1 Registered trademark of the DuPont company.

31


bolt torque values

1 Preliminary tightening snug all head bolts in the sequence shown. Final torqueing torque all head bolts in the sequence shown to the listed value.2 Retorque to the listed value after 2 5 hours running time.

model

Conn. rod bolt ftlb

bearing Carrierftlb

bearing Cover ftlb

Crank-case

inspec plate ftlb

x-head guideftlb

Cyl. to head(1.2)ftlb

valve Cover plate boltftlb

valve hold-down screw

2ftlb

piston Lock nut

torqueftlb

piston screw torqueinlb

valve Cap torque

(w/ gaskets)

ftlb

valve Cap torque

(w/ O-rings)

ftlb

91 28 38 38 15 30 20 40 45 50 40 25

291 28 30 30 13 25 20 40 45 50 40 25

491 30 26 35 8 33 33 35 40 45 100 40 25

691 40 40 40 9 40 30 37 40 60 100 40 25

32


Clearances and dimensions

91 291 491691/d891

(M crankcase)**Clearance: X piston figure 5.4A &

5.4b0.0200.044

0.0200.044

0.000/0.0200.024/0.044

0.000/0.015 0.012/0.027

Clearance: connecting rod bearing to crankshaft journal

0.00050.0025

0.00050.0025

0.00050.0025

0.0019 0.0035

Clearance: wrist pin to wrist pin bushing* (max)

0.0009 0.0009 0.0009 0.0020

Cylinder bore diameter (max) 3.009 3.009 4.011 4.515Cylinder finish (rMS) 16-32 16-32 16-32 16-32Piston ring radial thickness (min) 0.082 0.082 0.082 0.082Clearance: oil pump adapter shaft to

bushing* (max)0.0050 0.0050 0.0050 0.0050

Crankshaft end play (cold)0.0000.002

0.0000.002

0.0000.002

0.002 0.003

Flywheel runout at O.d. (max) 0.020 0.020 0.020 0.020Clearance: crosshead to crosshead

guide bore (max)0.011 0.011 0.012 0.013

Crosshead guide bore finish 32 rMS (limited number of small pits and scratches are acceptable)* Dimensions for honing are included with new bushings (which must be installed, then honed).** Clearance should be set with machine cold.

33

Appendix Cvertical dou

compressor troubleshooting

Documents

maintenance of corken

corken instructions

implied warranty

ordering parts

parts subject

incorrect parts

expressed warranty period

serial number